Clonic spasm refers to an involuntary muscle contraction that typically occurs in a repetitive and rhythmic manner. There are several synonyms for clonic spasm, such as convulsion, seizure, seizure activity, muscular twitching, and myoclonus. Convulsion is a general term used to describe violent and involuntary muscle contractions that can occur in various parts of the body. Seizure activity, on the other hand, refers to abnormal electrical activity in the brain that can lead to sudden and uncontrolled movements. Muscular twitching is a less severe form of clonic spasm that involves rapid and involuntary movements of a muscle or group of muscles. Finally, myoclonus refers to sudden and rapid contractions of a muscle or group of muscles that can occur spontaneously or as a result of stimulation.